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Making process of drill pipe with internally and externally thickened end

A manufacturing method and technology of drill pipe, applied in the field of steel pipe end thickening, can solve problems such as short Miu, achieve the effects of improving fatigue life and avoiding puncture accidents

Active Publication Date: 2008-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make a smooth transition between each thickening, it is necessary to accurately control the length of each thickening, and because the upsetting force of the hydraulic thickening machine is small, the length of each thickening is also relatively short, and the final superimposed The result will inevitably result in a shorter Miu

Method used

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  • Making process of drill pipe with internally and externally thickened end
  • Making process of drill pipe with internally and externally thickened end
  • Making process of drill pipe with internally and externally thickened end

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Embodiment Construction

[0037] Referring to Fig. 6, it shows a schematic view of the drill pipe before thickening. Before the first thickening, the pipe end of the drill pipe body 1 with a length L1 is heated for the first time. The heating temperature is 1150-1250°C. The length of L1 is at least 550mm.

[0038] Since the drill pipe end is thickened, the length of the drill pipe must be shortened, so the total length LA of the drill pipe end participating in the deformation is the sum of the length Liu of the inner thickening section, the length Miu of the inner conical section and the shortening amount of the drill pipe Lv. The calculation formula of drill pipe shortening Lv is shown in the following formula.

[0039] Lv = ( Dou 2 - dou 2 ) ( L...

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Abstract

The making process of drill pipe with internally and externally thickened end includes the following steps: determining the heating and thickening times, three times or four times, based on the wall thickness ratio between the thickened end and the pipe body; heating at 1150-1250 deg.c and internally and externally thickening, with the first heating length being over 550 mm; trimming the thickened ends and the transition sections for smooth transition. Compared with available technology, the present invention has the advantages of drill pipe Miu not short than 140 mm and prolonged fatigue life of the drill pipe.

Description

technical field [0001] The invention relates to a technology for thickening steel pipe ends. Background technique [0002] Drill pipes for oil drilling are manufactured according to API standards. Its structure is to butt-weld an external thread drill pipe joint and an internal thread drill pipe joint at both ends of the drill pipe body. Since the pipe body is thin, in order to increase the strength of the connection with the joint, the butt welding parts at both ends of the pipe body are thickened. There are three types of thickening: inner thickening, outer thickening and inner and outer thickening, among which inner and outer thickening are the thickening forms commonly used in drill pipes. [0003] As shown in Figure 1, for internal and external thickened drill pipes, D is the outer diameter of the pipe, d is the inner diameter of the pipe, Dou is the outer diameter of the upset end, and dou is the inner diameter of the upset end. Leu is the length of the outer thicke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/08B21K21/12B21D41/00
Inventor 赵鹏张建伟朱世忠丁维军
Owner BAOSHAN IRON & STEEL CO LTD